Good for you for doing everything you can to stop him.I have emailed the authorities already supplied by posters here and they have promptly replied and were very interested. Even if there is nothing done at least if they admonish him for doing this on wildlife grounds, it might just be another step to show he can not just do as he pleases, when he pleases.
Really fed up of him now. Can see how this sort of thing drives people crazy!
Only word of caution would be that it's quite possible that this neighbour might be unstable and may be outraged that you are taking action against him. You and your family should be very alert to / aware of that possibility and take extra security measures to ensure your safety.